corollary

From Middle English, from Late Latin corōllārium (“money paid for a garland; gift, gratuity, corollary; consequence, deduction”), from corōlla (“small garland”), diminutive of corōna (“crown”).

• IPA^(key): /kɒˈɹɒləɹi/, /ˈkɒɹələɹi/
• (US) enPR: kôr'əlĕrē, IPA^(key): /ˈkɔɹəˌlɛɹi/
• (General Australian) IPA^(key): /kɔˈɹoʊˌlɛɹi/

• Audio (Southern England)

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corollary (plural corollaries)

1. A gift beyond what is actually due; an addition or superfluity.
2. An a fortiori occurrence, as a result of another effort without significant additional effort.

   Finally getting that cracked window fixed was a nice corollary of redoing the whole storefront.

3. (mathematics, logic) A proposition which follows easily from the statement or proof of another proposition.

   We have proven that this set is finite and well ordered; as a corollary, we now know that there is an order-preserving map from it to the natural numbers.

• corollary relief
• subcorollary

corollary (not comparable)

1. Occurring as a natural consequence or result; attendant; consequential.
   • 2019, Li Huang, James Lambert, “Another Arrow for the Quiver: A New Methodology for Multilingual Researchers”, in Journal of Multilingual and Multicultural Development, →DOI, page 11:

     However, given current sensibilities about individual privacy and data protection, the recording of oral data is becoming increasingly onerous for researchers who are obliged to navigate an often time-consuming and complex series of administrative requirements and corollary review processes in order to be granted ethics clearance.

2. (rare) Forming a proposition that follows from one already proved.

• “corollary”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.
• “corollary”, in The Century Dictionary […], New York, N.Y.: The Century Co., 1911, →OCLC.